Telegraphic relay.



I. KITSEE. TELEGRAPHIG RELAY. APPLICATION FILED JULY 2, 1910.

Patented May 2, 1911.

WIT/V5838 W ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

TELEGRAPHIC RELAY.

v Specification of Letters Patent.

Patented May .2, 1911.

Application filed July 2, 1910. Serial No. 570,140.

To all whom it may concern:

of the United States, residing at Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Telegraphic Relays, of which the following is aspecification.

My invention relates to an improvement in telegraphic relays and hasmore special reference to relays adapted to respond to feeble impulses,such for instance as are received on submarine cables.

In my experiments extending over a number of years, I have found that itis greatly advantageous .to provide'the relay contacts with graphitesurfaces. I have experimented with different arrangements and placed thegraphite at the tongue of the relay as well as on the stationarycontacts and I have found that the arrangement, as is illustrated anddescribed in this specification, is more advantageous than all' otherarrangements. I have found that a relay, in which the stationarycontacts are provided with graphite and the movable contacts are madeout of platinum, answers the purpose best where the line has a greatcapacity and where sticking and sparking would otherwise be present.

The drawing represents in diagrammatic view a preferred form of relayprovided with my invention.

In this drawing; 1 is the relay proper; 2 is the movable part ofcontacting tongue of same; 3 the contactsfor said tongue. These contactsconsist of a -metal,platinum or platinum iridium preferred.

4 and 5 are the stationary contacts. The stationary contact 1 consistsof the metallic screw 6 and the gra hite 7 This graphite is placed-inthe hol ow of the screw in a manner so as to securely fasten therein.The

p F stationary contact 5 consists of the metallic Be 1t known that I,IsIDoR Krrsnn, citizen screw 9 and the graphite 10. This graphite issecured to the screw in the same manner as the graphite is secured inscrew 6.

With such an arrangement and with substantially the relay asillustrated, I have received messages over the Canso-New York cable, thecable havin in round numbers 2,000,000 K. R. (capacity multiplied byresistance). The messages were received in Morse characters andtranslated with the aid of a sounder. In the drawing, this sounder isdesignated by the numeral 12 and is connected to the polar relay 13 withthe interposition of the batteries 14. Thepolar relay 13 is connected tothe line relay with the interposition of the batteries 15 and 16.

The cable is designated by the numeral 17.

Having now described my invention, what I claim as new and desire tosecure by Letters-(Patent is 1. In a relay, a movable and a stationarycontact, one of said contacts consisting of metal and the other ofsaidcontacts consisting of graphite.

2. In combination with a telegraphic re lay, stationary and movablecontacts therefor, the movable contacts comprisinga metal, thestationary contacts comprising graphite supported by a metal.

.- 3. A telegraphic relay provided with a ISIDOR K-ITSEE.

Witnesses:

MARY 0. SMITH, ALVAH RITTENHOUSE.

